[rime client] Sending over trailing space to help indicate end of utterance after a punctuation.

src/pipecat/services/rime.py

@@ -244,7 +244,9 @@ class RimeTTSService(AudioContextWordTTSService):
     async def flush_audio(self):
         if not self._context_id or not self._websocket:
             return
+        
         logger.trace(f"{self}: flushing audio")
+        await self._get_websocket().send(json.dumps({"text": " "}))
         self._context_id = None
 
     async def _receive_messages(self):